AGRICULTURAL EXPERIMENT STATION. 197 



the bibliography of this insect, and to Prof. Riley for use of cuts. 

 Prof. Jordan has taken a personal interest in following the 

 res( arches. By his liberal policy the work has been advanced 

 and this report so fully illustrated. Many points, not of espec- 

 ial economic importance, but of zoological consequence, have been 

 incorporated in this Eeport, it being the present policy of this 

 Station to record in its Bulletins all the results of research, both 

 technical and practical. 



We feel gratified that circurr stances have enabled us to make 

 these important investigations. It cannot be hoped that the work 

 is entirely free from error, but an endeavor has been made to 

 faithfully record what the eyes have seen. The cuts illustrating 

 this Report, so far as they are original, were made by the writer, 

 or photographed from microscopic preparations made by him, and 

 may be regarded, as to outlines, reasonably correct. The 

 drawings of the male and female flies were modified from Prof. 

 Comstock's cut in the U. S. Dept. of Agr. Rept., 1881-2. 

 We have also included unchanged from the same plate the excel- 

 lent figures of the pupa, jaw system, cephalic and caudal spiracles, 

 and a plate illustrating Pomace Flies. 



The work is humbly submitted as a contribution to the life his- 

 toiy of th's insect, with the hope that it may aid somewhat in an 

 intelligent struggle with this serious pest. 



Sketch of Work, 1888-9. 



The investigation was commenced under great diflflculiies. The 

 way had to be felt step by step. At the time we began work 

 Trypeta was unknown to us about Orono. TLe complaints were 

 mostly from the Western part of the State. The material for 

 study had to be sent by mail or express from the infested district. 



Work began July 5th, 1888 upon the Benoni, a sub acid, early 

 autumn variety. The apples bt that date were about three-fourths 

 of an inch in diameter. Observations were continued that season 

 until Nov. 6th. Thougli this variety was regarded by some as an 

 unlucky choice, and that an early sweet apple would have been 

 better, yet the results show it seived the purpose well. We 

 selected this variety because it was badly affected in 1887, and 

 because it was an autumn variety and would enable us to continue 

 the investigation later in the season. Though this vaiiety was 

 made the basis of regular observations many other varieties 

 were incidentallv examined. 



